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《Iron & Steel》 2017-12
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Influence of annealing treatment on microstructure and mechanical properties of low-carbon Ni-containing DP steel

DING Li-juan;SHI Chun-li;YIN Hong-xia;ZHANG Tao;LI Hui;College of Engineering,Yantai Nanshan University;National Engineering Research Center for Plastic Working of Aluminum Alloys,Shandong Nanshan Aluminum Co.,Ltd.;  
A low carbon and Ni-containing DP steel was studied. The CCT curve was analyzed by Gleeble3500 simulation tester,and then different annealing treatment was designed based on this curve. Based on the five factors and four levels of orthogonal test,combing mechanical test and SEM investigation,the influence of annealing treatment on microstructure and mechanical properties of DP steel was analyzed. The results indicate that the A_(c1) and A_(c3) are 712 and 928 ℃respectively. During the continuous cooling process,the critical cooling rate of transformation of bainite and martensite are 5 and 30 ℃/s respectively. The biggest factors influencing ratio of yield strength and tensile strength is annealing temperature,and annealing time of n value. The heat treatment to gain best properties is to anneal at 840 ℃ for 210 s in the beginning,then cooled to 740 ℃ slowly,finally quenched to 350 ℃ and holding for 240 s.
【Fund】: 山东省自然科学基金资助项目(ZR2016EMP05)
【CateGory Index】: TG142.1;TG161
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